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Rapid assembling organ prototypes with controllable cell-laden multi-scale sheets

Bio-Design and Manufacturing 2019年第1期2卷 1-9页

作者： qing Gao Peng zhao Ruijian Zhou Peng wang Jianzhong Fu Yong He Slate Key Laboratory of Fluid Power and Mechatronic Systems. School of Mechanical Engineering. Zhejiang University. Hangzhou 310027. China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province. School of Mechanical Engineering Zhejiang University Hangzhou 310027 China

A native organ has heterogeneous structures, sirength, and cell components. It is a big challenge to fabricate organ prototypes with controllable shapes, strength, and cells. Herein, a hybrid method is developed to fabricate organ prototypes with controlled cell deposition by integrating extrusion-based 3D printing, electrospinning, and 3D bioprinting. Multi-scale sheets were first fabricated by 3D printing and electrospinning;then, all the sheets were assembled into organ prototypes by sol-gel react io n duri ng bioprinting. With this method, macroscale structures fabricated by 3D printing ensure the customized structures and provide mechanical support, nanoscale structures fabricated by electrospinning offer a favorable environment for cell growth, and different types of cells with controllable densities are deposited in accurate locations by bioprinting. The results show that L929 mouse fibroblasts encapsulated in the structures exhibited over 90% survival within 10 days and maintai ned a high proliferation rate. Furthermore, the cells grew in spherical shapes first and then migrated to the nano scale fibers showing stretched morphology. Additionally, a branched vascular structure was successfully fabricated using the presented method. Compared with other methods, this strategy offers an easy way to simultancously realize the shape control, nanolibrous structures, and cell accurate deposition, which will have potemidi applications in tissue cngineering.

关键词： Organ prototypes 3D printing Electrospinning 3D bioprinting Multi-scale sheets

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Forging-microstructure-tensile properties correlation in a new nearβhigh-strength titanium alloy

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Rare Metals 2021年第8期40卷 2109-2117页

作者： Huan wang She-Wei Xin Yong-qing zhao Wei Zhou Wei-Dong Zeng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Titanium Alloy Research Institute Northwest Institute for Nonferrous Metal ResearchXi’an710016China

Microstructures and tensile properties of a newβhigh-strength titanium alloy Ti-5321(Ti-5 Al-3 Mo-3 V-2 Zr-2 Cr-1 Nb-1 Fe)were investigated in this *** microstructures,including equiaxed microstructure(EM),bimodal microstructure(BM),basket-weave microstructure(WM)and lamellar microstructure(LM),were tailored by changing the forging process,and the influences of different microstructures on tensile properties were also *** results indicated that Ti-5321 exhibits a better combination of strength and ductility,compared to Ti-5553,Ti-1023,BT22 and *** ultimate tensile strength,total elongation and reduction in area could be achieved in a range of 1200-1300 MPa,10%-15%and40%-60%,*** influences of variant selection on the tensile properties in Ti-5321 alloy were also ***βforging and solution treatment,αphase maintained strictly Burgers orientation relation with adjacentβ*** features of the fractography in BM and LM were also explored to further explain the tensile properties and the fracture mode of Ti-5321 alloy.

关键词： New nearβtitanium alloy Forging process Variant selection Tensile properties

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直纺32头43 dtex/72 f涤纶FDY细旦丝生产

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聚酯工业 2018年第3期31卷 27-29页

作者：沈国建赵汝青王友志高春祥浙江天圣化纤有限公司浙江绍兴302030

采用熔体直纺工艺路线,对32头纺FDY 43 dtex/72 f细旦涤纶长丝的生产工艺技术进行了研究,着重介绍了直纺装置侧吹风条件下熔体输送工艺及纺丝组件过滤要求、喷丝板孔径选择、缓冷器温度影响、侧吹风冷却条件、热辊拉伸等生产工艺技术,... 详细信息

采用熔体直纺工艺路线,对32头纺FDY 43 dtex/72 f细旦涤纶长丝的生产工艺技术进行了研究,着重介绍了直纺装置侧吹风条件下熔体输送工艺及纺丝组件过滤要求、喷丝板孔径选择、缓冷器温度影响、侧吹风冷却条件、热辊拉伸等生产工艺技术,通过设备改造与工艺条件的控制,成功在侧吹风装置上开发出32头细旦FDY涤纶系列长丝产品,品质优良。

关键词：涤纶熔体直纺 32头纺细旦FDY

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Theoretical Study on Resonance Raman Spectra of Tetraoxaporphyrin Dication by TDDFT Calculation

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Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： Guo-bing wang Hui-qing zhao Zhen-lin Zhang Wen-lou wang Dong-ming Chen Department of Chemical Physics University of Science and Technology of China Hefei 230026China Department of Chemistry College of Basic Medicine Anhui Medical University Hefei 230032 China

The B state excited resonance Raman scattering of tetraoxaporphyrin dication (TOP2+) was theoretically studied with DFT/TDDFT calculations and the sum-over-states approach of polarizability including both the A and B terms contributions. The resonance Raman spectra calculated with PBE1PBE, B3LYP, Cam-B3LYP, and B3LYP-D3 functionals are similar to each other in general, with PBE1PBE and B3LYP being better in reproducing resonance Raman intensities in comparison with the experiment. The calculated relative intensities of the totally symmetric modes are excellently consistent with the experiment. The TDDFT calculations manifested a considerable deformation of the B state along the ν2, ν6, ν7, and ν8 modes, which is responsible for the strong resonance Raman intensities of these modes. The resonance Raman intensities of non-totally symmetric modes were calculated to be weaker than the totally symmetric modes by one or two order of magnitude, which qualitatively agrees with the experiment. However, the resonance Raman intensity of the ν10 mode (CβCβ stretch, B1g symmetry) predicted by TDDFT calculations is unexpectedly small whereas that of the ν11 mode (symmetric CαCm stretch, B1g symmetry) is too large, which is assumed to be caused by the Jahn-Teller instability for the B state of TOP2+.

关键词： Tetraoxaporphyrin Resonance Raman TDDFT Excited state structure Franck-Condon mechanism

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Defect engineered electrocatalysts for C-N coupling reactions toward urea synthesis

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Chinese Chemical Letters 2024年第8期35卷 7-14页

作者： Shengkai Li Yuqin Zou Chen Chen Shuangyin wang zhao-qing Liu Guangzhou Key Laboratory for Clean Energy and Materials/Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationGuangzhou UniversityGuangzhou 510006China State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan UniversityChangsha 410082China

Urea is extensively used in agriculture and chemical industry,and it is produced on an industrial scale from CO_(2)and Haber-Bosch NH_(3)under relatively high temperature and high pressure conditions,which demands high energy input and generates masses of carbon *** conversion of CO_(2)and N sources(such as NO_(2)^(−),NO_(3)^(−),and N_(2))through electrocatalytic reactions under ambient conditions is a promising alternative to realize efficient urea *** note,the design of electrocatalyst is one of the key factors that can improve the efficiency and selectivity of C-N coupling *** engineer-ing is an intriguing strategy for regulating the electronic structure and charge density of electrocatalysts,which endows electrocatalysts with excellent physicochemical properties and optimized adsorption en-ergy of the reaction intermediates to reduce the kinetic *** this minireview,recent advances of defect engineered electrocatalysts in urea electrosynthesis from CO_(2)and various N reactants are firstly *** discussions of C-N coupling in these advances are presented,with the aim of directing future investigations on improving the urea ***,the prospects and challenges of de-fect engineered electrocatalysts for urea synthesis are *** overview is expected to provide in-depth understanding of structure-reactivity relationship and shed light on future electrocatalytic C-N coupling reactions.

关键词： Electrocatalysis Defective electrocatalyst Co-reduction C-N coupling Urea synthesis

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An Experimental Prototype of an Innovative Fluid-driven Electromagnetic Stirring Technique

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Journal of Iron and Steel Research International 2016年第5期23卷 422-427页

作者： Bo wang Xiao-dong wang Yuri KOLESNIKOV San ZHANG Yan-qing TAN Xian-zhao NA College of Materials Science and Opto-electronic Technology University of Chinese Academy of Sciences Institute of Thermodynamics and Fluid Mechanics Ilmenau University of Technology State Key Laboratory of Advanced Steel Processing and Products Central Iron and Steel Research Institute

A new electromagnetic stirring technique that is driven by hydrodynamic forces was presented. This technique offers the following advantages. First,the stirrer can be immersed in the liquid metal,thereby significantly increasing the penetration depth of the electromagnetic forces and significantly improving the stirring efficiency; thus,this technique is particularly suitable for large-scale liquid metal. Second,under certain conditions,this technique can overcome difficulties that are encountered with traditional stirrers,such as accessing regions that are difficult to reach in working spaces with complex or narrow shapes. This stirrer also has a simpler structure than a traditional stirrer; thus,the design can be easily modified,and no external power supply is required. An experimental prototype was also presented for controlling the fluid flow rate,thereby controlling the electromagnetic force and velocity field of the driven liquid metal. The velocity distribution in a liquid Ga In Sn alloy under fluid-driven electromagnetic stirring was quantitatively measured using ultrasonic Doppler velocimetry（ UDV）. The primary results show that a remarkable velocity field has been achieved and that fluid-driven electromagnetic stirring is an effective means of stirring liquid metal. Finally,the potential applications of this technique in industry,along with key challenges,were discussed.

关键词： fluid electromagnetic stirring liquid metal skin effect Lorentz force

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Enhanced electron transport through two-dimensional Ti_(3)C_(2) in dye-sensitized solar cells

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Rare Metals 2022年第9期41卷 3078-3085页

作者： Gang wang Li-Jiao Ma Bing-Xin Lei Heng Wu zhao-qing Liu Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Key Laboratory of Electrochemical Energy Storage and Light Energy Conversion Materials of Haikou CitySchool of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou571158China School of Materials and Environment Guangxi University for NationalitiesNanning530006China Guangzhou Key Laboratory for Clean Energy and Materials Huangpu Hydrogen Innovation CenterInstitute of Clean Energy and MaterialsSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China

Two-dimensional(2D)Ti_(3)C_(2) material has a wide range of photovoltaic applications due to its unique electronic,optical,and plasmonic ***,we present a series of Ti_(3)C_(2)(0,0.6,0.8;wt%)nanosheets-modified P25 nanoparticles as photoanode films for dye-sensitized solar cells(DSSCs).The DSSC based on P25 and 0.6 wt%Ti_(3)C_(2) photoanode achieves a fairly good efficiency(9.22%),which greatly exceeds the counterpart based on the pure P25(7.16%).Benefiting from high light scattering and metallic electrical conductivity of Ti_(3)C_(2) additive,the P25/Ti_(3)C_(2)-based DSSC exhibits a superior behavior of controlling photogenerated charge recombination compared with pure P25 one.

关键词： Ti3C2 Conductivity Charge transfer Dyesensitized solar cells

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Plant–soil microbe feedbacks drive seedling establishment during secondary forest succession:the‘successional stage hypothesis’

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Journal of Plant Ecology 2023年第6期16卷 259-270页

作者： qing Liu Wenqiang zhao CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China

INTRODUCTION Forests are increasingly under threat due to logging,fire,severe drought and other natural disturbances,which may compromise their ability to conserve biodiversity and regulate climate systems(Powers and Marin-spiotta 2017).Extensive deforestation and forest degradation will leave behind a complex landscape consisting of a matrix of forest patches under different levels of succession(Quesada et al.2009).

关键词： forest seedling soil

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Construction and Application of Quenching Critical Cooling Rate Model

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Journal of Iron and Steel Research International 2010年第3期17卷 40-45页

作者： FU Tian-liang wang Ri-qing wang zhao-dong wang Guo-dong wang Ming-tao The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Productive Sector Northern Heavy Industries Group Co Ltd Shenyang 110025 Liaoning China Heat Treatment Workshop Linfen Medium Plate Plant Taiyuan Iron and Steel Group Linfen 041000 Shanxi China

Based on exploring quenching mechanism, three types of quenching critical cooling rate models of mediumcarbon steel and low-carbon steel and low-alloy construction steel were established, as modified Maynier model, Eldis model and isothermal curve model, respectively. During construction process, regression analysis and Newton interpolation method were used for higher calculated precision. Through comparing and analyzing, the superior one was selected to evaluate the full hardening thickness after quenching. According to hardness analyzing, the deviation between predicted hardness distribution and the experimental value is within 6%.

关键词： medium-carbon steel and low-carbon steel low-alloy construction steel critical cooling rate hardenability

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Effect of ceramic work rolls on surface roughness of rolled SUS304 ultra-thin strips

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Journal of Iron and Steel Research International 2024年第7期31卷 1704-1718页

作者： Peng-cheng Li Tao wang Chen-chen zhao Qi Liu qing-xue Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Surface morphology and roughness are important parameters of surface quality of cold-rolled ultra-thin strip *** order to study the effect of Si_(3)N_(4) ceramic work rolls on the surface roughness of SUS304 ultra-thin strip,ABAQUS finite element model calculation,3D laser profilometry,and other methods were adopted based on the physical characteristics of Si_(3)N_(4) ceramic roll and 9Cr2MoV steel roll,like anti-flattening performance and oil *** surface morphology and roughness of SUS304 ultra-thin strip rolled by different material work rolls under oil lubrication conditions were *** results showed that under the rolling force of 10 kN,the maximum flattening amount of Si_(3)N_(4) ceramic roll was reduced by 35.14%compared to that of 9Cr2MoV steel *** reduction rate of SUS304 ultra-thin strip rolled by ceramic roll was 34.19%,while that rolled by steel roll was only 22%;Si_(3)N_(4) ceramic roll can further increase the number of alternating convex peaks and concave valleys in the rolled thin strip,reduce the profile steepness,reduce surface roughness,and enhance the planarization effect of surface micro-convex bodies,with improving surface quality and surface ***,the mechanism of Si_(3)N_(4) ceramic roll significantly improving the surface roughness of rolled SUS304 ultra-thin strip was proposed.

关键词： Ceramic work roll-Steel roll SUS304 ultra-thin strip Reduction Surface roughness

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